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Two smooth blocks of same mass are conne...

Two smooth blocks of same mass are connected by an inextensible and massless string which is passing over a smooth pulley are kept in a lift is going down with

acceleration 'a' as shown in the fig What should be the value of a (in `m//s^(2))` so that acceleration of block A w.r.t. ground will be minimum? `(g=10m//s^(2))`

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